Jump ring, round, 3mm, raw brass #37-101-0

[JasRonq]

I have a question about the item Jump Ring, Round, 3mm (Raw Brass) #37-101-0.

Round jump rings with 3mm outer diameter, 2.3mm inner diameter. 0.56mm thick (23 gauge).

2.3 + 0.56 + 0.56 = 3.42
3 - 0.56 - 0.56 = 1.88

So! What size is this ring really?

If it really does have an inner of 2.3 and a thickness of about what is says I will probably buy lots, but it the inner is really 1.88mm its nearly useless to me.

P.S.
#37-113-0 Jumpring, 4mm, raw brass

Round jump rings with 4mm outer diameter, 3mm inner diameter. 0.73mm thick (21 gauge).

4-3=1
0.73*2=1.46
Again, what size is this ring really?

And again with the 5mm...

Jump Ring, Round, 5mm (Raw Brass)
Round jump rings with 5mm outer diameter, 4.2mm inner diameter. 0.81mm thick (20 gauge).

0.81*2=1.62
5-4.2=0.8
True size?

and again..

Jump Ring, Round, 6mm (Raw Brass)
Round jump rings with 6mm outer diameter, 4.6mm inner diameter. 0.91mm thick (19 gauge).

6-4.6=1.4
0.91*2=1.82

and so on with the rest... please, what size are all the jump rings, really?

[daverobertson]

This is a reasonable question, JasRonq, let's see what we can find out.

[mar-clar]

37-101 series of Jump Rings

OD 3.2mm / ID 2.18-2.25mm / Wire Thickness .021'' ( 24 gauge )

37-113 series of Jump Rings

OD 4.4mm / ID 3.15mm / Wire Thickness .025'' ( 22 gauge )

37-136 series of Jump Rings

OD 5.6mm / ID 3.65mm / Wire Thickness .032'' ( 20 gauge )

37-145 series of Jump Rings

OD 6.6mm / ID 4.5mm / Wire Thickness .036'' ( 19 gauge )

Sorry about the confusion.
I will update our system with the correct information.
Thank You.

[JasRonq]

Excellent! Thank you for the corrected info, I can now decide which sizes are useful to me. Btw, After going through the brass rings, I went to gun metal and saw the same sort of problems. You guys should check the stated sizes on all of your jump rings to make sure they are correct, or at least the stated numbers are self consistent.

Looking again to decide on the rings I had to check the math again...

37-101 series of Jump Rings

OD 3.2mm / ID 2.18-2.25mm / Wire Thickness .021'' ( 24 gauge )

37-113 series of Jump Rings

OD 4.4mm / ID 3.15mm / Wire Thickness .025'' ( 22 gauge )

37-136 series of Jump Rings

OD 5.6mm / ID 3.65mm / Wire Thickness .032'' ( 20 gauge )

37-145 series of Jump Rings

OD 6.6mm / ID 4.5mm / Wire Thickness .036'' ( 19 gauge )

.021" is actually  between 23 and 24 gauge. If I take that as accurate though, that converts to 0.5334mm.
3.2mm - (0.5334*2) = 2.1332 which is below the range "ID 2.18-2.25mm".
.020" or .508mm is 24 gauge and that puts the ID right at 2.18mm

.032" = .81mm
.81mm * 2 = 1.62mm + 3.65mm = 5.27mm not 5.6mm
.036" = .91mm
.91mm * 2 = 1.82 + 4.5 = 6.32mm not 6.6mm
They are better, but still off enough to make a difference.

"OD 4.4mm / ID 3.15mm / Wire Thickness .025'' ( 22 gauge )" is the only one here that works out correctly.

I'm sorry to pick on you guys like this, but when you volunteer specific information for public viewing, you should check your arithmetic. I was glad to see corrections but going back over them as I said I would, you can see they don't all add up. Also, why mix inches and millimeters??

[mar-clar]

When your original question was posted I did not use a mathematical formula to provide the information you requested.
I personally measured the stock items you inquired about with a digital caliper.
The information provided is an accurate representation of the goods we currently have on hand.